Secant blade lift, swing all by the handle adjustment, simple and efficient.

割线锯片升降，摆动全部由手柄调节，简便高效。

youdao

As the aircraft accelerates, the airspeed of a blade (and thus the amount of lift it provides) increases when that blade is moving forwards and decreases when it is moving backwards.

当飞机加速时，当叶片向前移动，叶片的空速(以及以此叶片提供提升力的总额)增加；当叶片后移时，叶片的空速降低。

youdao

But when flying forward the air passing over the blade that is advancing to the front of the helicopter (and so into oncoming air) provides more lift than the one that is retreating to the back.

但是当向前飞行时，它的旋翼将转向直升飞机的前方(如此一来，就变成朝向迎面而来的空气)，经过叶片上方的气流将比经过叶片背面的气流产生更大的升力。

youdao

As the aircraft accelerates, the airspeed of a blade (and thus the amount of lift it provides) increases when that blade is moving forwards and decreases when it is moving backwards.

ECONOMIST: Chop, chop

Wind blade equipment today, probably constitutes roughly 20% of ocean-borne multi-purpose heavy lift cargo today.

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